From a1127abbae67ac3a9c154b1914b15f1e16deca56 Mon Sep 17 00:00:00 2001 From: Rainer Gerhards Date: Mon, 15 Mar 2010 09:29:54 +0100 Subject: bugfix(minor): handling of extremely large strings in dbgprintf() fixed Previously, it could lead to garbagge output and, in extreme cases, also to segfaults. Note: this was a problem only when debug output was actually enabled, so it caused no problem in production use. --- runtime/debug.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'runtime/debug.c') diff --git a/runtime/debug.c b/runtime/debug.c index 4504aaad..bc581a5d 100644 --- a/runtime/debug.c +++ b/runtime/debug.c @@ -961,6 +961,15 @@ dbgprintf(char *fmt, ...) va_start(ap, fmt); lenWriteBuf = vsnprintf(pszWriteBuf, sizeof(pszWriteBuf), fmt, ap); va_end(ap); + if(lenWriteBuf >= sizeof(pszWriteBuf)) { + /* prevent buffer overrruns and garbagge display */ + pszWriteBuf[sizeof(pszWriteBuf) - 5] = '.'; + pszWriteBuf[sizeof(pszWriteBuf) - 4] = '.'; + pszWriteBuf[sizeof(pszWriteBuf) - 3] = '.'; + pszWriteBuf[sizeof(pszWriteBuf) - 2] = '\n'; + pszWriteBuf[sizeof(pszWriteBuf) - 1] = '\0'; + lenWriteBuf = sizeof(pszWriteBuf); + } dbgprint(NULL, pszWriteBuf, lenWriteBuf); } -- cgit v1.2.3